94 p. T. CLEVK, SYNOPSIS OF THE NAVICULOID DIATOMS. • 



broad, linear. Central area a transverse fascia, reaching to the margin. Strife parallel, 7 to 7,5 

 0,0 1 mm. — PL 1 f. 16. 



Slightly brackish water: Sweden (postglacial deposit of Ebbetorp in Kalmar Lan)! Mouth 

 in of Delaware! Connecticut! 



69. P. eardinalis Ehb. (1>S40). — V. linear, with broad, rounded ends. L. 0,i.'i to 0,2; 

 B. 0,03 to 0,osh mm. Median line distinctly complex, central pores approximate, terminal fissures 

 comma-shaped, small Axial area wide; central area a broad transverse fascia, reaching to the 

 margin. Strife 5 in 0,oi mm., slightly divergent in tlie middle and convergent at the ends, crossed 

 by a broad band. — Stauroptera eardinalis Ehb. Berl. Abh. 1840 p. 213 (accord, to Chase). Pinmil. 

 eardinalis W. Sm. Br. D. I PI. XIX f. 166. Nav. eardinalis A. S. Atl. XLIV f. 1, 2. V. H. Syn. 

 p. 74 Suppl. PI. A f. 5. 



Fresh water: Sweden (Lapland to Smaland loss.)! Finland! Ireland, Scotland (Loch Leven, 

 Ordie Deposit), Belgium (V. H.), Italy (Livorno, Atl.). Switzerland (Brun). 



IX. Marinse. 



Artificial key. 



^ J Asymmetrical 2. 



\ Symmetrical 3 



Strise strongly radiate P. Stauntonii Grun. 



slightly — P. ambigua var. Digitus A. S. 



1 Axial area broad 4. 



I — — narrow or indistinct ii. 



) Valve narrow P. anihigxia Cl. 



\ — broad P. Tempvrei Brun. 



Central nodule stauroid P. bistriata Leud. Fortm. 



not — tj. 



j Central area large, orbicular 7. 



\ — ^ a transverse fascia 10. 



Stri* crossed by a blank band 8. 



not — — — 9. 



I Valve linear P. Trevelyana Donk. 



\ — lanceolate P. Granlandica Cl. 



f ) Striae 3 to 4 in 0,oi mm P. excellens Cl. 



' ' \ — 8 to 10 — — P. rectangulata Greg. 



I Valve biconstricted P. Clnvicidus Greg. 



lO I — constricted in the middle 11. 



( — not or slightly constricted in the middle 12. 



j L. 0,1 mm P. lobafa Grove a. Sturt. 



|L. about 0,0.3.=) mm P. constricta Cl. 



J Axial area indistinct 13. 



\ — — narrow 14. 



Strise parallel P. quadratarca A. S. 



{ 



{ 



{ 



\ — radiate in the middle, convergent at the ends P. cruciformis Donk. 



{ 



Stri* 12 in 0,oi mm P. cruciata Cl. 



— 15 to 20 — P. Jloridana Cl. 



70. 1*. iiinbiglia Cl. N. Sp. - V. linear, with rounded ends. L. (»,u3;} to 0,o7 8; B. O.oo: 

 to 0,008 mm. Central nodule small, terminal nodules small, approximate to the margin. Area 

 broad, linear, not widened in the middle. Strife short, parallel, 8 to 9 in (>,oi mm., with capitate 

 terminations. — Nav. rctusa Grun. A. D. p. 38 (1880). Cl. Vega p. 470 PI. XXXVl f. 35. 



Marine: Lysekil (Bohuslan. Sweden, Grun.), Oldenburg (Grun.), Cape Wankarema! 



The frustule is according to Grunow, in the zone-view more or less constricted in the 

 middle and more or less broad. The connecting zone has numerous punctate longitudinal divisions 



